JT,
I have removed bees from a lot like that. Pictures of it are here in the archives somewhere.
I used a chainsaw and cut the log length wise on 2?sides and pried it apart. There is a good chance the queen was killed when it dropped. In my early years, during winter, I tried placing supers on top of a log but they never moved up. Probably because the queen had died.
Good luck.
Jim Altmiller